Beginnings: a lost drone

It all started with a lost drone. As sometimes happens with drones, a silly teenager flew a drone into the forest never to be seen again. So we had an extra controller. We took it apart to see what was inside and to see if we could recognize the parts (Picture?). We did recognize several parts: joysticks (just two rotary potentiometers at 90 degree angles). There was a chip we did not recognize (the TX chip?).